Ethan Shanfeld Ryan Gosling showed off his singing and dancing chops in “Barbie” with its musical centerpiece, “I’m Just Ken.” Now, fans of the Greta Gerwig blockbuster can watch behind-the-scenes footage of Gosling rehearsing the epic pop number alongside his Ken co-stars including Simu Liu and Ncuti Gatwa. In the four-minute featurette, Gosling goes through the various stages of rehearsal as he makes Gerwig burst out laughing as he strips off his white fur coat. The video intercuts clips of Gosling practicing his moves in sweatpants and a backwards hat in a dance studio with footage from the finished film.